arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.00537math.NAcs.NA
收藏

含不定矩阵项复杂系统的鲁棒迭代法

Robust iteration methods for complex systems with an indefinite matrix term

Owe Axelsson, Maeddeh Pourbagher, Davod Khojasteh Salkuyeh

摘要:

具有不定矩阵项的复值系统出现在重要的应用中,例如对于某些时谐偏微分方程,例如麦克斯韦方程和亥姆霍兹方程。具有对称正定矩阵的复杂系统可以通过用实矩阵将复杂矩阵系统重写为2 × 2分块矩阵形式来容易地求解,所述实矩阵可以通过使用预条件方块(PRESB)预处理方法的迭代来有效地求解,并且优选地通过Chebyshev方法来加速。然而,不定矩阵项的出现造成了一些困难。为了处理这个问题,我们提出了不同形式的矩阵分裂方法,有或没有任何参数。一个矩阵谱分析,然后广泛的各种形式的方法的数值比较。

英文摘要:

Complex valued systems with an indefinite matrix term arise in important applications such as for certain time-harmonic partial differential equations such as the Maxwell's equation and for the Helmholtz equation. Complex systems with symmetric positive definite matrices can be solved readily by rewriting the complex matrix system in two-by-two block matrix form with real matrices which can be efficiently solved by iteration using the preconditioned square block (PRESB) preconditioning method and preferably accelerated by the Chebyshev method. The appearances of an indefinite matrix term causes however some difficulties. To handle this we propose different forms of matrix splitting methods, with or without any parameters involved. A matrix spectral analyses is presented followed by extensive numerical comparisons of various forms of the methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑